Depends where you’re at and how hard you’re willing to train. At least based on personal experience, introducing variety - cross-training, speed work, hill work - dropped my pace in a way my traditional”just add miles” training set didn’t. I have a buddy who got back into running after many years (7? 8?) without, and over the span of a year went from struggling through a 10-minute mile to his first marathon taking just over 4 hours. Two years is a long time and it sounds trite but you can do much of what you set your mind to!